Magneto call-bell



(No Model.)

J. SMITH. MAGNETO CALL BELL.

No. 526,982. Patented Oct. 2,1894

1. UNITED STATES PATENT OFFICE.

JOSEPH BRODIE SMITH, OF MANCHESTER, NEW HAMPSHIRE.

MAG N ETO CAL L-BELL.

SPECIFICATION forming part of Letters Patent No. 526,982, dated October2, 1894.

Application filed April 27, 189 1.

To all whom it may concern.-

Be it known that I, J OSEPH BRODIE SMITH, a citizen of the UnitedStates, and a resident of Manchester, in the county of Hillsborough andState of New Hampshire, have invented new and useful Improvements inMagneto Call-l3ells, of which the following, taken in connection withthe accompanying drawings, is a specification.

This invention relates to improvements in magneto call bell devices fortelephones and it is carried out as follows, reference being had to theaccompanying drawings, wherein Figure 1, represents a top plan view ofthe invention in its normal position partly shown in section. Fig. 2,represents a cross section on the line 2-2 shown in Fig. 1. ,Fig.3,1'epresents a side elevation of the circuit breaker showing it inposition while ringing in a call preparatory to using the telephone; andFig. 4, represents a modification of the pinion on the armature shaft.

Similarletters refer to similar parts wherever they occur on thedifferent parts of the drawings.

A represents the call box of a telephone as usual in which is located amagneto generator composed of horse shoe magnets B, B, B, having polepieces 0, G, and revolving armature D, secured to a shaft d journaled inbearings E, E, as shown.

F, is the wire of the armature winding, one end of which is metallicallyconnected to the shaft (1 and having its other end connected to aspindle d which projects beyond one end of the shaft d and is insulatedfrom the latter as fully shown in Fig. 1.

The armature shaftd is longitudinally movable in its bearings and has atone end secured to it a pinion G the teeth of which are preferably madeinclined or helical relative to the axis of said shaft as shown in Fig.1 and adapted to mesh in correspondingly inclined or helical teeth onthe spur gear H secured to the shaft I which is suitably journaled andprovided with a crank t', outside of the box A by means of which it maybe rotated whenever it is desired to ring in a call.

The armature,it's'axis and pinion G are normally held in the positionshown in Fig. 1 preferably by means of a spring K arranged between thebearing E and pinion G which Serial No. 509,198. (No model.)

causes the outer face of said pinion to be held againsta suitable stopplate, bracket or equivalent device L secured preferably to the insideof the box A as shown in Fig. 1.

M and N are spring metal electrodes insulated from each other andsecured in a suitable rnanner to the interior of the call boxA as shownin Figs. 1 and 3. During the use of the telephone said spring electrodesare other preferably by means of a metal peg or projection M attached tothe spring electrode M as shown but this precise arrangement is notessential as such peg may be made on either or both of said electrodesor they may be so'bent or shaped as to normally be held in metalliccontact with each other without departing from the essence of my invention. 1 To the electrodes M, N, are metallically connected therespective wires m, at, leading to the telephone circuit through theelectro magnet of the call bell.

It will be noticed that during the normal position of the electrodes M,N, the latter are cut out from contact with the armature shaft 01 andits insulated projection 01' which are the terminals of the armaturewinding F. By turning the crank shaft 1 the inclined gear H acting ontheinclined pinion G causes the latter, the armature and its shaft 01 to bemoved against the influence of the spring K in direction of arrow shownin Fig. 1 causing the normally held in metallic contact with each metalprojection d to be brought against the electrode N, by which it is movedout of contact with the projection M on the electrode M after which theend of the armature axle d is brought in metallic contact with theelectrode M as fully shown in Fig. 3, thus closing the circuit throughthe magneto machine and causing the call bell to be sounded in the callbox, central station or connecting telephones.

As soon as the operator stops turning the crank shaft I the armature andits shaft are automatically returned by the influence of the spring K tothe position shown in Fig. 1 by which the magneto machine is cut outfrom the electrodes M, N, and the latter brought in metallic contactwith each other.

Instead of using inclined gears H, G, as shown in Fig. 1 I may to equaladvantage use ordinary gears H G as shown in Fig. 4 and provide theshaft cl with a pin or projection adapted to enter an inclined slot inthe pinion G or a pin or projection may be attached to said pinion andadapted to Work in an inclined groove on the shaft 61 by which the sameobject is obtained namely to cause a longitudinal movement of thearmature shaft of the magneto machine in the direction of arrow shown inFig. 1 when the crank shaft I is rotated for the purpose stated.

Having thus fully described the nature, construction, and operation ofmy invention, I wish to secure by Letters Patent and claim 1. A magnetocall device for telephones con sisting of a magneto machine havingarotary and longitudinally movable armature shaft, a crank-shaft, gearingintermediate said armature-shaft and crank-shaft for imparting thelongitudinal movement to the armatureshaft during its rotation, saidarmature-shaft being adapted when rotated to break the circuit and cutin the armature of the magneto generator, and a spring for returningsaid'armature-shaft to its normal position when at rest, substantiallyas described.

2. A magneto call device for telephones, consisting of a magneto machinehaving a rotary and longitudinally movable armature shaft, a pinion Gmounted upon one end of said shaft and having inclined teeth on itsperiphery, a crank-shaft I having a crank handle '5 and spur-gear H,inclined teeth on the spurgear meshing with the teeth on the pinion,acircuit breaker operated by the longitudinal movement of the armatureshaft to break the circuit and cut in the armature of the magnetogenerator, and a spring for returning the armature shaft to its normalposition, substantially as described.

3. A magneto call device for telephones consisting of a magneto machinehaving a rotary and'longitudinally movable armature shaft, a pinion Gmounted upon one end of said shaft and having inclined teeth on itsperiphery, a crank-shaft I having a handle i and spur-gear H, inclinedteeth upon the spur-gear meshing with the teeth of thepinion,aninsulated projection upon the armature-shaft, a

pair of electrodes connected to the telephone circuit and normally heldin metallic contact with each other, and adapted to be disconnected andbrought into the armature circuit of the magneto machine by the rotationof the armature-shaft, a spring for returning said armature-shaft, and astop-plate L, substantially as described.

In testimony whereof I have signed my name to this specification,in thepresence of two subscribing witnesses, on this 13th day of April, A. D.189%.

JOSEPH BRODIE SMITH.

Witnesses:

ALBAN ANDREN, KITTIE M. HANSON.

